A variety of network and Dial Backup Interface Modules (NIMs and DIMs) are available to support a breadth of network applications in NetVanta 1335, NetVanta 4430, and NetVanta 3000/5000/7000 Series. Access slots in various NetVanta chassis support a variety of Voice Interface Modules (VIMs) for multi-port analog trunk and station interfaces as well as T1/PRI voice functionality.